I really think the only guessing game here is Button or Throw. The overhead in B1 comes out super fast, but cancelling into the low has 24frames start up. So its easily fuzzied AT BEST, and I say at best because for starters that reactable, and secondly, just finishing the B1 string goes Mid, Overhead, Low, meaning you don't even need to change your blocking pattern, blocking the string normally still blocks B1xLow Cane.